DE102016224698A1 - Device for influencing an engine noise, which reflects an engine vibration and driving conditions - Google Patents

Abstract

An apparatus for influencing engine noise, which reflects engine vibration and driving conditions, includes a tone generator that generates a gain sound to supplement non-linear engine noise. The apparatus comprises a vibration sensor that measures engine vibration as a noise source of the engine, a signal processing controller that receives the signal of the vibration sensor in real time and controls the sound generator so that the engine noise can maintain linearity, and an amplifier that provides a control signal of the signal processing controller receives and then supplements to transmit the supplemented control signal to the tone generator.

Description

BACKGROUND

Technical area

The present disclosure relates to vehicle engine noise, and more particularly to an engine noise control device that reflects engine vibration and driving conditions.

Description of the Related Art

Vehicle noise related research can be classified as research relating to how to emit as little noise as possible from a noise source, research relating to shielding sound with sound absorbing materials, and research relating thereto to cancel a noise by means of an active noise control or compensate. More specifically, the active noise control technology may control the noise to be identical to or less than a booming band using a reverse phase sound source. As the technology suitable for minimizing vehicle noise, the technology can also cancel a noise by generating an opposite sound wave for the sound by a sound device when the noise occurs.

Among the above technologies, the method using sound absorbing materials has proved effective for high frequency noise above 500 Hz. However, the sound absorbing technology increases the cost because the size of the sound absorbing materials should be increased to be effective for low frequency noise , Further, the use of a sound absorbing material is difficult, or there is a need to vary the materials when there is a need for weight reduction, such as in an airplane or a vehicle.

In addition, because environmental issues have recently become serious, there is a demand for a vehicle that consumes less fuel to reduce the exhaust gas amount. As a solution to this problem, there is a desire to reduce the weight of a vehicle and increase the efficiency of an engine in use. However, this approach may necessarily exert a negative influence on vibrations and noises of a vehicle.

Therefore, an active noise control technology and technique have recently been developed. In a conventional active noise control, as in 1 shown is an internal noise of a vehicle with a microphone 1 captured and through a filter 2 filtered. The filtered noise is then converted to a digital signal and through an analog-to-digital (AD) converter 3 applied to a controller. The controller applies multiple algorithms to the input value so as to develop a control signal (ie, the control signal which generates a control noise with a phase reversed to the sensed noise) to minimize the current noise level. The control signal is then converted to an analog signal by a digital-to-analog (DA) converter. The analog control signal is then applied to an amplifier 4 applied. After that, the control signal, after passing through the amplifier 4 has been amplified by a speaker 6 output.

The active noise control technology, however, only serves to reduce the interior noise of a vehicle. The technology does not reflect the driver's needs in terms of dynamic engine noise.

As a technique for compensating, there is active sound design (ASD) technology. The ASD technology is designed to reflect the needs of the driver by pre-recording virtual sound sources, such as advanced vehicle interior noise, and reproducing the sound sources through an internal speaker while driving a vehicle. In other words, as in 2 shown to have the conventional ASD system: a microphone 10 as a sensor for detecting a noise; a control unit 30 for detecting a motor RPM, an APS signal, and the like, depending on the sound passing through the microphone 10 and realizing a preset target acceleration tone or voyage for the entire rpm range; a selector 40 suitable for selecting the accelerating tone or the driving tone; and a speaker 50 by the control unit 30 the acceleration sound or the driving sound to the vehicle interior gives.

However, the existing active noise control and active sound design technologies and techniques use the microphone to measure noise and use a speaker to generate a separate noise (the sound by means of a control signal or pre-recorded virtual sound sources) to the sound to correspond. Therefore, these technologies and techniques have a problem that speaker control is delayed and the driver can therefore sense or detect the difference or delay.

In addition, the origin position of an engine sound from an engine room and the origin position of the separate noise from each other, which is generated by the speaker, are different. The loudspeaker is installed in the vehicle interior for the existing active noise control and active sound design systems. Therefore, the driver can feel, hear or detect the difference again.

The Korean patent with registration number 10-1081159 (11.01.2011) discloses such existing technology.

The foregoing is intended merely to assist in understanding the background of the present disclosure, and is not intended to imply that the present disclosure falls within the scope of the prior art that is already known to those skilled in the art.

SUMMARY

The present disclosure has been devised in an effort to provide a device for controlling engine noise that reflects vibration characteristics of an engine. The device detects an order component of the engine vibration in real time to detect the vibration characteristic of the engine, maintains a linearity of the engine noise depending on the vibration characteristic of the engine and controls a Zieltoneigenschaft, and generates an amplifying engine noise so to realize the desired engine sound or the desired engine noise.

The apparatus according to the present disclosure for influencing engine noise, which reflects engine vibration and driving conditions, may include, to achieve the above-described objects: a tone generator 100 for generating a boost noise to supplement a non-linear engine noise; a vibration sensor 200 for measuring an engine vibration as a noise source of the engine; a signal processing controller 300 for receiving the signal of the vibration sensor 200 in real time and to control the tone generator 100 so that a linearity of the engine noise can be maintained; and an amplifier 400 which is a control signal of the signal processing controller 300 receives and then amplifies to the amplified control signal to the tone generator 100 transferred to.

The tone generator 100 can be mounted in an engine compartment.

The device for influencing engine noise, which reflects engine vibration and driving conditions, may further include a sensor 500 for detecting driving conditions of a vehicle and then to the signal processing controller 300 Transmitting a signal or information reflecting the driving conditions.

The sensor 500 may include one or more of a motor revolution detection unit 310 a gear shift stage detection unit 520 , or an opening quantity detecting unit 530 for an accelerator pedal.

The device for influencing engine noise, which reflects engine vibration and driving conditions, may further include a microphone 600 for detecting the engine noise supplemented by the supplemental engine noise to maintain linearity.

The apparatus for controlling engine noise, which reflects engine vibration and driving conditions, may further include PID control 700 for controlling the tone generator 100 have, so that through the microphone 600 measured engine noise may correspond to a preset target engine noise map.

The signal processing control 300 can the tone generator 100 so as to maintain the linearity of an order component to prevent the separation of the order component from being generated depending on the variation of engine vibration in the engine noise or order component according to one or more preset orders of the engine.

The order of the engine may be a proportional constant of the number of revolutions of the engine and a frequency of a crankshaft of the engine, and the one or more preset orders of the engine may include one or more of a second order component, a fourth order component, or an eighth order component; from a variety of order components.

A sound card relating to the engine noise depending on the engine vibration may be used as data in the signal processing controller 300 stored, and the signal processing control 300 can the tone generator 100 control so that the engine noise of the sound card can correspond.

Several in signal processing control 300 stored sound cards may be provided, and any one of the plurality of sound cards may be used.

The signal processing control 300 can the tone generator 100 so that any one or more order components of the plural order components can maintain the linearity, and can individually control the plurality of order components.

The signal processing control 300 can the tone generator 100 control in real time to augment or modulate any one or more ordering components of the plurality of ordering components.

As described above, according to the present disclosure, the apparatus is capable of realizing an immediate and natural engine noise (engine sound) reflecting the engine vibration characteristic which becomes the sound source of the engine noise.

In addition, even if the noise is increased due to a deterioration of a vehicle, the apparatus is capable of maintaining the initial state of engine noise (engine sound) by using a microphone and a PID controller to reflect it.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects, features and advantages of the present disclosure will become more readily understood from the following detailed description, taken in conjunction with the accompanying drawings, in which:

1 and 2 a simplified scheme ( 1 ) and a block diagram ( 2 ) according to the prior art systems;

3 FIG. 10 is a block diagram showing an engine noise influencing apparatus that reflects engine vibration and driving conditions according to the present disclosure; FIG.

4 (a) and 4 (b) Are diagrams illustrating effects of the present disclosure;

5 FIG. 12 is a state diagram of the present disclosure when applied to a vehicle. FIG.

DESCRIPTION OF PREFERRED EMBODIMENTS

Terms and words used in the present specification and claims are not necessarily to be construed in accordance with their general or dictionary meaning. Instead, the terms and words may be construed according to meaning and concepts that correspond to the technical ideas of the present disclosure based on a principle that the present inventors may properly define the present disclosure according to the concepts or terms to describe their disclosures. Therefore, the configurations described in the embodiments and drawings of the present disclosure are merely exemplary embodiments, but do not represent all the technical content of the present disclosure. Therefore, the present disclosure should be construed to include all changes, equivalents, and substitutions at the time of filing this application within the scope of the present disclosure. When it is determined that the detailed description of a technology is well known and that incorporation thereof may unnecessarily obscure the concept of the present disclosure, the detailed description thereof has been omitted herein. An embodiment of the present disclosure will be described in detail hereinafter with reference to the accompanying drawings.

3 FIG. 10 is a block diagram of an apparatus for controlling engine noise reflecting engine vibration and driving conditions in accordance with the present disclosure. FIG. With reference to 3 For example, an apparatus for controlling engine noise that reflects engine vibration and driving conditions according to the present disclosure may include: a tone generator 100 , a vibration sensor 200 , a signal processing controller 300 , an amplifier 400 , a sensor 500 , a microphone, and a proportional-integral derivative mechanism or a PID controller 700 that is a control loop feedback control.

The tone generator 100 may play a role in generating a boost noise to augment nonlinear engine noise. The tone generator 100 may be a loudspeaker, but is not limited thereto, and may therefore be replaced by other components capable of performing the same role, depending on the project of the Designer. In this regard, the detailed description of the non-linear engine noise will be described later.

The tone generator 100 can be mounted in an engine compartment of a vehicle. In other words, the tone generator 100 be mounted in the position of the origin of the engine noise, that is, within the engine compartment. The separate sound produced by the loudspeaker is different from a sound produced by the sound generator 100 is produced because the speaker is mounted in the vehicle interior, with all the existing active noise controls and active sound design systems. Therefore, in these existing systems, the driver can feel, hear or detect a difference due to the difference of the sound generation positions of the current engine noise and the speaker-generated noise, thereby degrading the perceived quality of a vehicle.

By comparison, the complementary noise that comes from the tone generator complements 100 is generated, the non-linear engine noise in a natural way, by the revealed tone generator 100 is mounted in the engine compartment according to the present disclosure, so that the driver can recognize the linearity of the engine noise. This is the tone generator 100 suitable for supplying the driver with the dynamic engine noise (engine sound), whereby the perceived quality of a vehicle is improved.

The vibration sensor 200 may play a role in measuring the vibration of the engine as a noise source of engine noise. In contrast, the existing active noise control and active sound design systems measure the vehicle interior noise by using a microphone mounted in a vehicle interior, and as a result, generate a separate noise (a sound by means of a control signal or a recorded virtual sound source) through a speaker. This creates a potential problem since a delay may occur before speaker control occurs, which in turn may cause the driver to feel, hear or feel the delay or difference. In more detail, the prior art systems, even when the engine vibration that is the source of engine noise changes, measure engine noise through a microphone in a vehicle interior. Then, such a system analyzes the measured engine noise and generates the separate noise (noise by means of a control signal or a recorded virtual sound source) to correspond to the change in engine noise. Therefore, for the driver who recognizes engine noise at the same time as the microphone, the driver can recognize that the separate noise (noise by a control signal or a recorded virtual sound source) is not generated synchronously, so that the driver feels the delay or difference , hear or capture. Due to this, the perceived vehicle quality deteriorates in the perception of the driver.

In comparison with these prior art systems, the present disclosure includes the vibration sensor 200 so that it is possible to measure the vibration of the engine as the sound source of the engine noise in real time, whereby the vibration sensor is adapted to reflect the characteristics of the engine vibration, which is the source of engine noise, whereby an immediate and natural engine noise (engine sound) is realized.

The signal processing control 300 can the signal of the vibration sensor 200 received in real time. The signal processing control 300 can then play a role of controlling the tone generator 100 play so that the linearity of the engine noise can be maintained. The signal processing control is described in more detail 300 suitable and for controlling the tone generator 100 provided so that the linearity of an order component of the engine noise is maintained. This is done to prevent the order component from being generated in response to the change in engine vibration in the engine noise (order component) depending on one or more preset orders of the engine.

In this regard, the order of the engine refers to a proportional constant of one revolution (rpm) and one frequency of a crankshaft. The one or more preset orders of the engine may include at least one of a second order component, a fourth order component, or an eighth order component. That is, the order of the engine is an index indicating how many times the crankshaft rotates per second, and can be expressed by the following Equation 1.

[EQUATION 1]

• Order = crankshaft rotation frequency / (motor UPM / 60 sec.)

Further, the second order component of the engine noise is due to the order when the crankshaft makes two rotations. Demensprechend is the fourth order component of the engine noise due to the order, if the crankshaft rotates four times, and the eighth order component of the engine noise is due to the order when the crankshaft makes eight turns. The reason why one or more of the preset order components of the motor as described above include the second order component, the fourth order component, and the eighth order component is that the second order component, the fourth order component, and the eighth order component will be in the low frequency range therefore exert a large influence on the engine noise.

That is, the engine noise detected by the driver is the harmonized sound of various order components. Therefore, the present disclosure considers the second order component, the fourth order component, and the eighth order component as low frequency components that exert a large influence among the various order components. However, the present disclosure is not limited thereto and may further include various order components depending on the designer's intention or the like.

Furthermore, the signal processing control 300 real-time control of a combination (that is, the engine noise harmonized by the trim components) of real-time ordering components that determine engine noise or sound characteristics.

In other words, the signal processing controller 300 suitable for the tone generator 100 so that the plurality of order components are individually controlled so that any one or more order components (particularly low frequency components having a large influence on determining engine noise characteristics) among the plural order components can maintain the linearity in the engine noise. That is, the signal processing controller 300 is suitable and for controlling the tone generator 100 provided to supplement or alter one or more ordering components among the plurality of ordering components.

In more detail, the signal processing controller can be described 300 individually control the multiple order components to provide the driver with the engine noise or engine sound corresponding to vehicle characteristics. For example, the present disclosure may individually control the multiple ordering components in real time so that only the second ordering component among the plurality of ordering components can maintain linearity. In such an embodiment, the signal processing controller performs 300 It may not be possible to provide additional control even if there is a separation of the other order components (the fourth order component, the eighth order component, etc.).

Hereinafter, with reference to 4 (a) . 4 (b) and 5 an amplification of the nonlinear engine noise and the linear engine noise is described. With reference to 4 (a) and 4 (b) In each case the second order component, the fourth order component and the eighth order component are shown. As you can see, the separation ("disconnection") occurs in each order component in the 4 (a) on.

More specific is the area in 4 (a) in which the disconnection occurred, shown immediately after starting (area 1). The area where disconnection occurs after starting and then after a certain period of time has elapsed is also shown (area 2). The area where the disconnection occurred after a certain period of time has elapsed and then start off or acceleration is also shown (area 3).

The disconnection may occur upon a sudden change in the vibration of the engine as the sound source of the engine noise. The sudden change may be caused by a change in the driving state of a vehicle such as a sudden gear shift, a quick acceleration, and the like. In addition, when the disconnection occurs, the harmonized engine noise (engine noise harmonized with the second, fourth, and eighth order components) detected by the driver also changes quickly, causing the driver discomfort.

To prevent this, the signal processing control 300 the signal of the vibration sensor 200 Receive in real time and recognize whether the vibration or vibration of the engine is suddenly changed or not. When it recognizes that the above-mentioned change of the engine vibration occurs, the signal processing control can 300 also the tone generator 100 control to generate the amplification noise. In this regard, the generated noise may be apt to play a role of filling the area where separation mentioned above occurs. This is the signal processing control 300 to prevent, on the other hand, that the separation of the order component is generated according to the change of the engine vibration in the engine noise (order component) according to the one or more pre-set engine orders. In other words, this signal processing control 300 a role of controlling the tone generator 100 so that the harmonized engine noise (the engine noise harmonized with the second, fourth, and eighth order components) can maintain linearity.

Further, a sound card may be related to the engine noise by the engine vibration as data in the signal processing control 300 be saved. The signal processing control 300 can the tone generator 100 control, so that the engine noise can correspond to the stored data of the sound card.

That is, the sound card includes data that is pre-stored and set to correspond to a type (eg, sports car or saloon) of a vehicle. In the case where the engine noise maintaining the linearity is not satisfied as described above, the tone generator can 100 Accordingly, it may be tuned or compared with the preset data and the tuned sound card so as to generate an additional amplifying noise, thereby increasing the satisfaction of a driver with respect to the engine sound to improve the perceived quality of a vehicle.

The sound card may include various alternative sound cards, such as a dynamic sound card (eg, a sound card for a sports car) and a silent sound card (eg, a sound card for a luxury sedan) and the like. However, the one or more stored records of the sound cards are not limited to these or any specific examples, and may be additionally set by the designer. In addition, the sound cards in the signal processing control 300 stored, and any sound card among these sound cards, depending on the design of the vehicle-type designer, can be set for use.

Therefore, the engine noise influencing apparatus, which reflects engine vibration and driving conditions, can be installed and used regardless of the vehicle type. The device may be suitable or adjusted before delivery of a vehicle, depending on the vehicle type to use any sound card.

The amplifier 400 may have a role of receiving and amplifying / supplementing the control signal of the signal processing controller 300 play to the amplified / complementary control signal to the tone generator 100 to convey.

The sensor 500 can detect the driving conditions of a vehicle and then drive state information to the signal processing controller 300 to transfer. The sensor 500 may include one or more of: an engine revolution detection unit 510 a gear shift stage detection unit 520 , or an opening quantity detecting unit 530 for detecting a position or movement of an accelerator pedal. In other words, the sensor can 500 Detect driving conditions of a vehicle, such as engine revolutions or RPMs, a gear shift stage or an operation amount of an accelerator pedal, and then to the signal processing controller 300 Transmit signals or information corresponding to detected driving conditions.

Accordingly, the signal processing controller 300 more specifically, to prevent generation of separation of the order component by driving conditions of a vehicle such as engine vibration via the vibration sensor 200 , an engine revolution or an rpm state, a gear shift stage and / or change or an operation amount of an accelerator pedal are taken into consideration.

The microphone 600 can be mounted in a vehicle interior and can play a role in detecting the engine noise as perceived in the interior of the vehicle and which has been amplified by means of the booster motor noise to maintain the linearity. The PID control 700 may have a role of controlling the tone generator 100 play, so that the engine noise, that of the microphone 600 is measured, and how it is perceived in the vehicle interior, can be met, that is, tuned or compared with the preset Zielmotortonkarte.

In more detail, the engine noise entering the vehicle may be increased due to an aging process of a vehicle or the like. As long as the non-linear engine noise is not amplified, the driver may feel discomfort due to the increase in engine noise himself, thereby deteriorating the perceived vehicle quality.

By the engine noise in the vehicle interior by using the mounted in the vehicle interior microphone 600 is detected, the PID control 700 therefore according to the present disclosure the tone generator 100 control so that the engine noise can match the preset target engine map. In order to delay or offset the engine noise, the tone generator can 100 for example, so controlled be that the amplification noise is generated with a reverse phase in relation to the engine noise.

4 (a) and 4 (b) FIG. 12 are diagrams for explaining the effects of the present disclosure. FIG. 5 FIG. 12 shows a state diagram of the present disclosure as may be used on a vehicle. FIG. With reference to 4 (a) It can be confirmed that the disconnection occurs in the case of a vehicle in which the present disclosure is not applied to each order component. Accordingly, the engine noise (the engine noise harmonized with the second, fourth, and eighth order components), as detected by the driver, changes rapidly, causing a lack of comfort, causing discomfort to the driver.

By comparison, with reference to 4 (b) In the case of a vehicle to which the present disclosure is applied, the area where the separation occurs in each order component becomes the supplemental noise due to the amplifying sound filled. As a result, it can be confirmed that the linearity of the engine noise (the engine noise harmonized with the second, fourth and eighth order components) as recognized by the driver is maintained. Therefore, the present disclosure can provide the driver with the dynamic engine noise (engine sound), thereby improving the perceived quality of a vehicle.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• KR 10-1081159 [0010]

Claims (10)

Device for influencing an engine noise, which reflects engine vibration and driving conditions, the device comprising: a tone generator ( 100 ) adapted to generate a supplemental noise to supplement a non-linear engine noise; a vibration sensor ( 200 ) capable of measuring engine vibration as a noise source of the engine noise; a signal processing controller ( 300 ), which is adapted to a signal of the vibration sensor ( 200 ) in real time and the tone generator ( 100 ) so as to be able to maintain linearity of engine noise; and an amplifier ( 400 ) which is adapted to a control signal of the signal processing controller ( 300 ) and then amplify and then send the control signal to the tone generator ( 100 ). Device according to Claim 1, in which the tone generator ( 100 ) is mounted in an engine compartment. Apparatus according to claim 1 or 2, further comprising a sensor ( 500 ) which is adapted to detect driving conditions of a vehicle and then information to the signal processing controller ( 300 ), which represents the driving conditions. Device according to Claim 3, in which the sensor ( 500 ) one or more of: an engine revolution detection unit ( 510 ), a gear shift stage detection unit ( 520 ), or an actuation amount detection unit ( 530 ) for an accelerator pedal. Device according to one of the preceding claims, further comprising a microphone ( 600 ), which is adapted to detect the engine noise, which is supplemented to maintain a linearity by means of the supplementary engine noise. Apparatus according to claim 5, further comprising a PID controller adapted to operate the tone generator ( 100 ) so that by means of the microphone ( 600 ) measured engine noise corresponds to a preset target engine noise card. Device according to one of the preceding claims, in which the signal processing control ( 300 ) is suitable to the tone generator ( 100 ) to maintain a linearity of an order component of the engine noise so as to prevent generation of a separation of the order component depending on a change in engine vibration in the engine noise or the order component according to one or more preset orders of the engine. The apparatus of claim 7, wherein the order of the engine is a proportional constant of a number of engine revolutions and a frequency of a crankshaft of the engine, and the one or more preset order components of the engine one or more of a second order component, a fourth order component or an eighth order component. An apparatus according to claim 7 or 8, wherein a sound card related to an engine noise depending on the engine vibration is used as data in the signal processing controller (Fig. 300 ), and the signal processing controller ( 300 ) is suitable to the tone generator ( 100 ) in such a way that the engine noise can correspond to the sound card, whereby in the signal processing control ( 300 ) stored sound card has a plurality of different sound cards and any sound card of the plurality of different sound cards is used. Apparatus according to claim 7, 8 or 9, wherein the signal processing control ( 300 ) is suitable to the tone generator ( 100 ), so that one or more ordering components of the plurality of ordering components can maintain the linearity and can individually control the plurality of ordering components, wherein signal processing control (FIG. 300 ) is suitable to the tone generator ( 100 ) in real time to supplement or modulate one or more ordering components of the plurality of ordering components.

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